Hi, This error "Illegal mix of collations (utf8mb4_general_ci,COERCIBLE) and (utf8mb4_uca1400_ai_ci,COERCIBLE) for operation '='" seems unique to your data/schema and unlikely caused by how MariaDB is packaged in Debian. Have you dived deeper into what the table schema is and what collations the columns use?
Have you found any upstream bug reports at jira.mariadb.org regarding this error code 1267?
